Angular correlation measurements on the gamma rays from caesium 133

Abstract

The theory of angular correlations is described in outline, with emphasis on gamma ray correlations. Previous work on Cs133 is summarised and discussed. The results of the correlation measurements are presented and interpreted in terms of the agreed features of the Cs133 decay scheme. Attention is also given to some uncertain details of the scheme, including the detection of a weak transition using the sum coincidence technique.